Method and device for shape extraction, and size measuring device and distance measuring device

摘要

When an image is captured in a wood lumber measuring mode, a distance to wood lumber is detected. An area extracting unit 51 for a component drawing image area extracts component image areas 53A-53L of the wood lumber. A drawing generator 61 for a component drawing image selects the component image areas 53A-53L successively to generate a component drawing image 62. Among shape lines in the component drawing image 62, an eliminator 66 eliminates a paracentral shape line 71, an edge side shape line 72, a peripheral shape line 73 and determined shape lines 74. If a total pixel number of a portion where an estimated elliptical shape 76 generated by a shape estimation unit 67 is overlapped on a residual shape line 75 disposed inside a corrected drawing image 64 is more than a threshold, it is judged that the estimated elliptical shape 76 is correctly shaped. An object shape determining unit 83 extracts the estimated elliptical shape 76 as a shape of wood lumber. A size measuring unit 84 measures a size of the estimated elliptical shape. A size determining unit 85 determines an actual size of the wood lumber according to the size measured by the size measuring unit 84, the distance to the wood lumber and a focal length.

主权项

1. A shape extraction device comprising:
an area extracting unit for recognizing component images in which it is presumed that an object in a particular shape is imaged within a frame, to extract component image areas from said frame in which said component images are respectively present; a drawing generator for sequentially selecting said component image areas, and converting images including said component image in said selected component image areas into respectively a drawing image, to generate a component drawing image; an eliminator for eliminating one shape line and/or a certain shape line as an unwanted shape line among shape lines included in respectively said component drawing image, said one shape line having a center in a substantially equal position to a center of said component drawing image and having vertical and horizontal sizes equal to or less than substantially a half of a size of said component drawing image, said certain shape line being disposed on a straight line passing a center point of said one shape line and a center point of said component drawing image; a shape estimation unit for determining an estimated shape by optimizing a size of said particular shape so as to correspond to a corrected drawing image after elimination of said unwanted shape line; an evaluation unit for judging appropriacy of said estimated shape by evaluating degree of overlap between said estimated shape and said corrected drawing image; and an object shape determining unit for specifying said estimated shape as a shape of said object extracted from said frame if it is judged that said estimated shape is appropriate.